Saturn 2007 Ion Owner's Manual page 159

The air-conditioning system removes moisture
from the air, so you may sometimes notice a small
amount of water dripping underneath your
vehicle while idling or after turning off the engine.
This is normal.
Defogging and Defrosting
Fog on the inside of windows is a result of high
humidity (moisture) condensing on the cool window
glass. This can be minimized if the climate
control system is used properly. There are
two modes to clear fog or frost from your
windshield and side windows. Use the defog mode
to clear the windows of fog or moisture and
warm the passengers. Use the defrost mode to
remove fog or frost from the windshield more
quickly. For best results, clear all snow and ice
from the windshield before defrosting.
Turn the left knob to select the defog or
defrost mode.
-
(Defog): This mode directs half of the air to the
windshield and the side window outlets and half to
the floor outlets. When you select this mode the
system runs the air-conditioning compressor. To
defog the windows faster, turn the temperature
control knob clockwise to the warmest setting.
0
(Defrost): This mode directs most of the air to
the windshield, with some air directed to the
side window outlets and the floor outlets. When
you select this mode the system runs the
air-conditioning compressor.
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